Study on the Drift Calibration Method and Device for the Tin Oxide pH Electrode

• 作 者: Chu-Neng Tsai Jung-Chuan Chou Shen-Kan Hsiung
• 机 构: Institute of Electronic Engineering Chung Yuan Christian University,Chung-Li,Taiwan 320,China,Gradua
• 出 处: 稀有金属材料与工程
• 发表日期: 2006年S3期
• 关键词: drift calibration readout compensate fabrication Drift drawback adding compensat

Drift phenomenon has been known as the drawback of sensors and causes inaccuracy on the long-term measurement. In general,there are two methods to reduce the drift problem.One is to tune the parameters of the fabrication process to improve the properties of the front-ended device.Another is to compensate the drift phenomenon by adding extra drift compensation circuit or software in the back-ended readout circuit.In this study,a drift calibration method for the potentiometric sensor was presented and the drift calibration method was performed by using the circuit.According to experimental results,the drift phenomenon of the SnO_2 pH electrode was reduced by the drift calibration device.

Drift phenomenon has been known as the drawback of sensors and causes inaccuracy on the long-term measurement. One is to tune the parameters of the fabrication process to improve the properties of the front -ended device. Another is to compensate the drift phenomenon by adding extra drift compensation circuit or software in the back-ended readout circuit. In this study, a drift calibration method for the potentiometric sensor was presented and the drift calibration method was performed by using the circuit. According to the experimental results, the drift phenomenon of the SnO 2 pH electrode was reduced by the drift calibration device.